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Financial Instruments - classification - AT1 issuances (Details)
$ / shares in Units, £ in Millions, $ in Millions
Dec. 31, 2021
GBP (£)
Dec. 31, 2021
USD ($)
$ / shares
Dec. 31, 2020
GBP (£)
Disclosure of Financial Assets and Liabilities [Line Items]      
Financial Liabilities £ 740,189   £ 755,667
Series U, Non-cumulative preference shares of US$0.01      
Disclosure of Financial Assets and Liabilities [Line Items]      
Financial Liabilities 494    
Par value per share | $ / shares   $ 0.01  
US$1.15 billion 8% notes      
Disclosure of Financial Assets and Liabilities [Line Items]      
Financial Liabilities £ 734   734
Notional amount of financial assets | $   $ 1,150  
Interest Rate 8.00% 8.00%  
US$2.65 billion 8.625% notes      
Disclosure of Financial Assets and Liabilities [Line Items]      
Financial Liabilities     £ 2,046
Notional amount of financial assets | $   $ 2,650  
Interest Rate 8.625% 8.625%